Vaccine can curb spread of bird flu
By Lauran Neergaard
Associated Press
WASHINGTON - Vaccines can keep chickens from dying of bird flu, but can immunized birds still silently spread infection?
It is an important question, as China and Vietnam vaccinate millions of chickens in an effort to stamp out a worrisome strain of bird flu called H5N1.
Scientists in the Netherlands put the question to a test -- using vaccines against a different flu strain -- and concluded that vaccinating poultry indeed can block viral spread between birds.
``Vaccination can be an attractive tool to prevent outbreaks of highly pathogenic AI viruses in poultry, thereby achieving the aim of eliminating the source of human infections,'' concludes lead researcher J.A. van der Groot of the Netherlands' Central Institute for Animal Disease Control.
Researchers also concluded that poultry vaccines' ability to stop viral spread should be tested before health authorities choose which one to use.
At least 68 people have died from H5N1 in Asia since 2003, almost all linked to contact with sick birds, and millions of birds have died or been slaughtered in an effort to contain the virus. Health experts fear that the bird flu could mutate into a virus that is easily passed from person to person, sparking a global epidemic.
So far, the H5N1 virus has not been found in U.S. birds. If a bird outbreak did occur here, the Agriculture Department stockpiles poultry vaccine that would be used to help contain it.
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